Publisher: J Fr Ophtalmol. 2017;40(10):865‐875.

Authors: B Valero, J-R Fénolland, R Rosenberg, D Sendon, C Mesnard, M Sigaux , J-M Giraud, J-P Renard

Fiabilité et reproductibilité des mesures de la pression intraoculaire par le tonomètre Icare® Home (modèle TA022) et comparaison avec les mesures au tonomètre à aplanation de Goldmann chez des patients glaucomateux [Reliability and reproducibility of introcular pressure (IOP) measurement with the Icare® Home rebound tonometer (model TA022) and comparison with Goldmann applanation tonometer in glaucoma patients].


Purpose: The Icare® Home tonometer is a new rebound tonometer, developed for intraocular pressure (IOP) self-monitoring. The main objective of our study was to evaluate the reliability and reproducibility of measurements taken with the Icare® Home tonometer in glaucoma patients compared to the Goldmann applanation tonometer. A secondary objective was to investigate factors that could influence the reproducibility of these measurements.

Materials and methods: Fifty-two glaucoma patients were included in this prospective, non-randomized, monocentric study. IOP measurements were performed on the right eye and then on the left eye in the following order (3 measurements of IOP for each method): air tonometer (T-Air), Icare® Home tonometer by the patient (RT-P), Icare® Home tonometer by an ophthalmologist (RT-O), Goldmann applanation tonometer (GAT).

Results: Forty-four patients (85%) managed to take their IOP on both eyes with the Icare® Home tonometer. Mean IOPs were 14.35±3.93mmHg (T-Air), 13.43±4.65mmHg (RT-P), 14.13±4.29mmHg (RT-O), 14.74±3.84mmHg (GAT). The intraclass correlation indices (ICC) on the 3 repeated IOP measurements were 0.924, 0.872, 0.947 and 0.957, respectively. Bland-Altman analysis found a mean difference (bias) between GAT and RT-P, between GAT and RT-O, and between RT-O and RT-P, respectively, of 1.31, 0.61 and 0.70mmHg, with a 95% confidence interval of -3.34 to 5.96, -3.91 to 5.14 and -3.44 to 4.84mmHg, respectively. The reproducibility of the measurements taken with the Icare® Home tonometer did not vary according to corneal thickness or age of the patients.

Conclusion: The Icare® Home tonometer provides reliable and reproducible IOP values in glaucoma patients, although it appears to slightly underestimate the IOP measurements compared to the Goldmann applanation tonometer.

Welcome to learn more about iCare’s unique technology for self-monitoring of intraocular pressure

Select your country or region to continue


If your country is not listed here or you are a healthcare professional, please go to the global website

Global site